Hitler's Commando Order (Kommandobefehl in German) that was secretly distributed to high command, ordering that all irregulars (ie. commandos) captured be handed over to the Sicherheitsdienst (SD: intelligence arm of the SS) for interrogation and execution.

Used in common speech as a reference to eradicating a group of (usually valiant) people.

It has recently surfaced in popular culture in the George Lucas film Star Wars Episode III: Revenge of the Sith, when Emperor Palpatine orders his Stormtroopers to "execute order 66", which is the instruction to kill all Jedi.

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This command was given by the Galactic Republic's Supreme Chancellor Palpatine to the Galactic Republic's Clone Troopers in Star Wars Episode III Revenge of the Sith. Order 66 indicated that the Jedis have betrayed the Galactic Republic and therefore the enemies of the Galactic Republic, the Jedis who are now traitors of the Galactic Republic are later on immediately killed by the Clone Troopers on sight.

The number 6 is probably a reference to classic hexagram, which is something used to put a curse on someone, sort of like the targeting reticle of a gunner.

The Urban Dictionary Mug

Quite possibly the greatest words ever said in a movie, "Order 66." Order 66 is the murder of all remaining Jedi placed by Emperor Palpatine. Watching one Jdi after another get slaughtered is one of the most fulfilling things I've ever seen. Bow down to your Dark Lord you weakling.

Darth Sidious: Execute order sixty-six.
Clone General: It will be done, my Lord.

The Urban Dictionary Mug

An order that came after 65 and before 67.This order said to kill off all Jedi of any and all ranks.The fucked upthing is that these guys are supposed to be so smart,but got their asses played for 3 straight movies,not to mention they didnt see any of this shit coming.The enemy was a bunch of half-retarded droids.How the fuck would they organize an army?!
2.What is yelled when nerds at a burger joint notice that the order ticket for a customer has the number 66 on it,in a nerdy reference to star wars.

The Urban Dictionary Mug

When a team turns against their leader, who is right, to incur favor with someone higher in the command chain. This references "Order Sixty-Six" in Star Wars: Revenge of the Sith, when the emporer issues the order for the soldiers to turn against the Jedi.

Even thoughVince had come up with a better proposal, the rest of the team Order 66ed him when the director disagreed. Now we're stuck using the directors plan.